Thomas & Friends (1984)

S05E13 Stepney Gets Lost

Feeling restless, Stepney persuades the Fat Controller to let him assist Mavis and Toby at the quarry for the day. He performs admirably during his shift, but on his journey back, he loses his way and accidentally finds himself in a scrapyard. There, the devious diesels 'Arry and Bert mistake him for scrap metal and plot to send him to the smelter!